JPH0520375U - Steady rest structure - Google Patents

Abstract

(57) [Abstract] [Purpose] The number of parts is small, workability is excellent, and the mounting area of circuit parts mounted on the printed circuit board is not limited,
The mounting pitch between each printed board can be reduced to support high-density mounting. [Arrangement] At a common position of each printed board 1, a duller-shaped mounting hole 4 in which a large diameter hole 2 and a small diameter hole 3 are connected is formed. The steady rest 10 is formed with an outer diameter H1 which is inserted into the large diameter hole 2 of the mounting hole 4. Further, on the outer circumference of the steady rest member 10, there is formed a groove 12 that engages with a part of the edge 3a of the small diameter hole 3 corresponding to the arrangement pitch width H3 of the printed board 1. The steady rest member 10 Is fixed by a long screw 13 to the base of the chassis 5 and the like.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a board steady structure for an electronic device or the like in which a plurality of printed boards are removably arranged in parallel with a mother board, for example.

[0002]

[Prior Art]

 For example, in the case of electronic equipment, etc., a plurality of printed boards on which various circuit components are mounted are arranged in parallel to one motherboard, and each printed board is hung vertically on both sides of a mother board. It is slid along the guide rail and can be attached to and detached from the mother board as needed. In addition, each printed board is fixed to the chassis that forms the base at multiple points. As a result, the vibrations from the outside were used to prevent steadying between the printed boards. In addition, by stopping the runout between the printed boards and fixing each printed board with a predetermined pitch width, the printed boards may be bent due to the bending of the printed boards, especially when a large printed board is used. Or, the circuit parts mounted on the printed circuit board were prevented from contacting each other.

FIGS. 8A and 8B show an example of the structure of such a steady rest between printed boards. In this steady rest structure, a mounting hole 22 for screwing is formed at a common position of the plurality of printed boards 21 to be steady, for example, in the center, and for the steady rest between the printed boards 21 and 21, For example, a hexagonal column 25 having a male screw portion 23 to be inserted into the mounting hole 22 of the printed board 21 at one end and a female screw hole 24 at the other end is used.

To further explain, in order to perform steady rest between the printed boards 21 (21A, 21B), first, the male screw of the column 25 (25A) is inserted into the mounting hole 26a of the chassis 26 which is the base located at the bottom. Insert the part 23 and tighten the nut 27 to fix it. Next, the printed board 21A is placed on the pillar 25A, and the male screw portion 23 of another pillar 25B is screwed into the female screw hole 24 of the lower pillar 25A through the mounting hole 22 of the printed board 21A from above. The printed board 21A is fixed to the chassis 26 via the upper and lower columns 25A and 25B. Hereinafter, when a plurality of printed boards are arranged in parallel, the work of mounting the printed boards 21 by the support columns 25 is repeated, and all the printed boards 21 are fixed to the chassis 26 through the support columns 25. A screw 28 is screwed into the female screw hole 24 of the uppermost column 25 to fix the uppermost printed board 21 to the chassis 26. In this way, each printed board 21 is fixed to the chassis 26 via the pillars 25 with screws one by one, so as to prevent steadying between the printed boards 21.

Further, when only the printed board 21A in the middle position needs to be removed for replacement of the parts mounted on the printed board, etc., the support column 25B and the printed board which are located on the target printed board 21A. 21B is temporarily removed, the target print board 21A is pulled out in parallel along a guide rail (not shown), parts are replaced, and then the print board 21A is inserted in the reverse order of the above, and then once again. The pillar 25B and the printed board 21B, which had been removed, were attached.

[0006]

[Problems to be solved by the device]

 However, in the above-described conventional steady rest structure, when the printed board 21A in the middle position is pulled out, the support pillars 25A located under the drawn-out printed board 21A inevitably remain, so that the printed board is centered on the mounting position of the support pillar 25A. The terminal is projected on the pattern surface of the printed board 21 on the part formed in the drawing direction of 21 (the part mounting surface and the pattern surface of the printed board 21 in the shaded area of FIG. 8A), and when the terminal is drawn out, There is a problem that it is not possible to mount a component that hits or a chip component that is mounted on the pattern surface, and the mounting area of the component mounted on each printed board 21 is limited. In addition, since the columns 25 with screws are used to prevent the printed boards 21 from resting, a minimum processing dimension h1 of the female screw holes 24 between the printed boards 21 is about 7 mm. The distance h2 between the plates 21 could not be reduced to about 5 mm or less. Therefore, for example, even when mounting the printed board 21 on which a very small chip component having a height of about 2 mm is mounted, the space h2 cannot be narrowed and efficient mounting cannot be performed.

On the other hand, instead of the above-mentioned threaded support 25, a mounting hole is formed at a common position of each printed board 21, and a ring-shaped spacer in which a through hole having the same diameter as this mounting hole is formed is provided on each print board. A structure has also been proposed in which one long screw is inserted and inserted between them to prevent steadying between the printed boards.However, when the long screws are removed, the individual spacers are separated. Therefore, there is a problem that workability is extremely poor. Moreover, when fixing the printed boards according to the height of the parts to be mounted on the printed boards, a plurality of spacers having different heights are required, and the management of the parts is troublesome.

Further, in order to prevent the components from being dispersed, a structure in which the above-mentioned spacer is fixed to the printed board by soldering is conceivable. In this case, the steady rest structure shown in FIGS. 8A and 8B is provided. Similarly, the problem that the mounting area of the component mounted on the printed board is limited cannot be avoided.

Therefore, the present invention has been made in view of the above problems, and an object thereof is to reduce the number of parts and workability, and to limit the mounting area of circuit parts mounted on a printed board. The present invention is to provide a steady rest structure that can cope with high density mounting by reducing the mounting pitch width between each printed circuit board.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, the steady rest structure according to the present invention is a steady rest structure of a plurality of printed boards 1 arranged in parallel, and mounting holes 4 and 16 formed at common positions of the respective printed boards, The steady rests 10 and 17 having grooves 12 and 18 which are inserted into the mounting holes and which engage with a part of the edges 3a and 16a of the mounting holes in accordance with the arrangement pitch width H3 of the printed board. And screws 13 and 15 for fixing the steady rest to the base portion 5.

[0011]

[Action]

 In order to prevent steadying between the printed boards 1 and 1, the steadying member 10 (17) is inserted into the mounting hole 4 (16) of each printed board 1 according to the arrangement pitch width H3 of each printed board 1. A part of the edge 3a (16a) of each mounting hole 4 (16) is locked in each groove 12 (18) of the steady rest 10 (17) formed. In this state, the steady rest member 10 (17) is fixed to the base of the chassis 5 or the like with the screw 13 (15).

[0012]

【Example】

 1 is an exploded perspective view showing a first embodiment of a steady rest according to the present invention, FIG. 2 is a plan view showing an assembled state of the steady rest structure, and FIG. 3 is a sectional view taken along the line AA of FIG. ..

A daruma-shaped mounting hole 4 in which a large diameter hole 2 and a small diameter hole 3 are connected is formed at a common position of each printed board 1, for example, in the center or four corners, and half of the small diameter hole 3 is large. It is connected to a part of the diameter hole 2 in common. The respective printed boards 1 having the mounting holes 4 formed therein are arranged in parallel, for example, between a chassis 5 serving as a base arranged at the bottom of the housing and a protective cover 6. Each printed board 1 is independently slid along a guide rail 7 and is connected to a common motherboard 8 via a connector 9 in a detachable manner.

The steady rest 10 having a cylindrical shape is locked in the mounting hole 4 of each printed board 1 to prevent the printed board 1 from swinging, and a through hole 11 is formed in the center thereof. Further, the outer diameter H1 of the steady rest 10 is formed to be slightly smaller than the diameter H2 of the large diameter hole 2. Further, on the outer circumference of the steady rest member 10, a groove 12 for retaining the edge portion 3a of the small diameter hole 3 is formed. The groove 12 extends to the through hole 11 so that the edge portion 3a does not easily come off due to vibration. It is formed to a depth D1 of about half of the above, and corresponds to the pitch width H3 of each printed board 1 connected to the mother board 8. Further, the inner peripheral surfaces on both sides of the groove 12 are formed with inclined surfaces 12a, which guide the edge portion 3a toward the center of the groove 12 when the edge portion 3a is locked in the groove 12.

The steady rest member 10 is formed to have a length substantially equal to the width H 4 between the front surface of the chassis 5 and the back surface of the cover 6, and the grooves 12 of the small-diameter holes 3 in the respective printed boards 1 are formed. The edge portion 3a is locked. In this state, one long screw 13 is inserted into the through hole 11, and the male screw portion 13a at the tip of the long screw 13 is inserted into the mounting hole 5a of the chassis 5 and fixed by the nut 14.

Next, in the above-described configuration, in order to prevent the printed boards 1 and 1 connected to the mother board 8 from swinging, first, the printed board 1 is swung into the large-diameter hole 2 of the mounting hole 4. The stopper member 10 is inserted. Next, the steady rest member 10 is moved in the direction of the small diameter hole 3, and the groove 12 of the steady rest member 10 is locked to the edge portion 3a of the corresponding small diameter hole 3 of each printed board 1. In this state, the cover 6 is placed on the steady rest 10, the long screw 13 is inserted into the hole 6a of the cover 6 and the through hole 11 of the steady rest 10, and the male screw portion 13a at the tip is attached to the mounting hole 5a of the chassis 5. And fix it with nut 14.

When removing the second printed board 1b from a desired position, for example, the long screw 13 is loosened, the cover 6 is removed, and the steady rest 10 is moved in the direction of the large diameter hole 2. Pull out from the large hole 2. In this state, the second printed board 1b from the top is pulled out along the guide rail 7 and removed. Then, after removing the printed board 1b, the steady rest member 10 is fixed again.

Therefore, in the above-mentioned embodiment, the steady member 10 can be fixed between the chassis 5 and the cover 6 with one long screw 13 to prevent the shake between the printed boards 1 and 1. .. Further, since each printed board 1 is locked in the groove 12 of the steady rest 10 through the edge portion 3a of the small-diameter hole 3 in the mounting hole 4, it is possible to use a conventional strut having a male screw portion and a female screw hole. It is not necessary, and only by changing the pitch width of the groove 12 according to the circuit component mounted on the printed board 1, high density mounting can be achieved.

Further, only the desired printed board 1 can be easily attached to and detached from the mother board 8 only by attaching and detaching the long screw 13 and the steady rest member 10. In addition, by removing the steady rest member 10, there is no pillar remaining on the printed board unlike the conventional case, so that it is possible to freely mount circuit components on the printed board 1 excluding the mounting holes 4. Therefore, the mounting area of the circuit component is not limited, and the area on the printed board 1 can be effectively used.

Further, since the inclined surface 12a is integrally formed in each groove 12 of the steady rest 10, the edge portion 3a of the small diameter hole 3 of each printed board 1 is not subjected to an unnecessary load, 3a can be naturally guided toward the center of the groove 12.

Next, FIG. 4 shows a second embodiment of the steady rest structure. In the steady rest structure according to this embodiment, mounting holes 4 similar to those of the first embodiment are formed in each printed board 1, and the outer circumference of the steady rest member 10 is the same as that of the first embodiment. Grooves 12 having inclined surfaces 12a are formed at predetermined intervals. The steady rest 10 is fixed to the chassis 5 by screwing the male screw portion 15a of the single short screw 15 into the female screw portion 10a formed on the lower portion, and the upper portion is opened. According to this embodiment, the steadying member 10 can be attached / detached from one direction of the chassis 5 side, so that the workability can be further improved.

Next, FIG. 5 shows a third embodiment of the steady rest structure. In the steady rest structure according to this embodiment, female screw portions 10a are formed on both upper and lower sides of the steady rest member 10, and the male screw portion 15a of the short screw 15 is screwed into each female screw portion 10a to secure the steady rest member 10. It is fixed to the chassis 5 and the cover 6. Since the other structures are the same as those in the first embodiment, the same reference numerals are given and the description thereof is omitted. According to this embodiment, the two positions on both sides of the steadying member 10 are fixed by the short screws 15, so that there is no limitation due to the length of the long screw 13 of the first embodiment and the runout of the second embodiment. Since the stop member 10 is cantilevered, there is no problem of strength. Therefore, the width between the chassis 5 and the cover 6 is large (H5> H4), and it can be effectively used when more printed boards 1 are attached to and detached from the motherboard 8.

Next, FIGS. 6 and 7 show a fourth embodiment of the steady rest structure. In the steady rest structure of this embodiment, a circular mounting hole 16 is formed at a common position of each printed board 1, and an outer diameter H7 of the mounting hole 16 is slightly smaller than the diameter H6 of the mounting hole 16. A groove 18 that locks a part of the edge portion 16a of the mounting hole 16 in the printed board 1 is formed in the outer peripheral half of the stopper member 17. Further, the upper and lower inner wall surfaces of the groove 18 form an inclined surface 18a, which guides the edge portion 16a toward the center of the groove 18. Further, a female screw portion 17a is formed at one end of the steady rest 17, and one short screw is formed in a state where the edge portion 16a of the mounting hole 16 in each printed board 1 is locked in each groove 18. It is fixed via the mounting hole 5a of the chassis 5 by the male screw portion 15a of the screw 15.

In the above-described configuration, in order to prevent steadying between the printed boards 1 and 1 connected to the motherboard 8, first, the steadying member 17 is inserted into the mounting hole 16 in each printed board 1. Next, the steady rest member 17 is moved in the direction in which the groove 18 is formed, and the groove 18 of the steady rest member 17 is locked to the edge portion 16a of a part of the mounting hole 16 in each corresponding printed board 1. .. In this state, the female screw portion 17a of the steady rest 17 is screwed onto the male screw portion 15a of the short screw 15 to fix the steady rest member 17 to the chassis 5.

In addition, when removing the second printed board 1b from a desired position, for example, the short screw 15 is removed, and the steady rest 17 is moved in the direction in which the groove 18 is not formed to attach the mounting hole. Pull out from 16. In this state, the second printed board 1b from the top is pulled out along the guide rail 7 and removed. Then, after removing the printed board 1b, the steady rest member 17 is fixed again.

It should be noted that the above-described embodiment may have a structure using one long screw 13 of the first embodiment or a structure using two short screws 15 of the third embodiment. Further, a common mounting hole 4 (16) is formed in each printed board 1, and a groove 12 (18) for locking a part of the edge portion 3 a (16 a) of the mounting hole 4 (16) is provided with a steady rest member. 10 (17), the steady rest 10 (17) is fixed to at least the chassis 5 forming the base. However, the mounting holes and grooves may have various shapes other than those in the above-described embodiments. Conceivable.

[0027]

[Effect of the device]

 As described above, according to the steady rest structure of the present invention, the steady rest is inserted into the mounting hole of each printed board, and the edge portion of the mounting hole is engaged with the groove of the steady rest to secure the steady rest. Since it is only fixed to the base part of the chassis with screws, workability is improved compared to the past, and this type of steady rest structure can be configured with the minimum necessary number of parts. Further, the area on the printed board can be effectively used without limiting the mounting area of the circuit component mounted on the printed board as in the past. Furthermore, by changing the pitch width of the grooves formed in the steady rest member, the mounting pitch width between the respective print plates can be reduced, and high density mounting can be achieved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a steady rest structure according to the present invention.

FIG. 2 is a plan view showing an assembled state of the steady rest structure.

3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view showing a second embodiment of a steady rest structure.

FIG. 5 is a sectional view showing a third embodiment of a steady rest structure.

FIG. 6 is a plan view showing a fourth embodiment of a steady rest structure.

7 is a sectional view taken along line BB of FIG.

FIG. 8A is a plan view showing an example of a conventional steady rest structure. FIG. 8B is a sectional view of the same.

[Explanation of symbols]

 1 Printed board 4,16 Mounting hole 3a, 16a Edge part (edge) 10,17 Steady stop member 12,18 Groove 13 Long screw (screw) 15 Short screw (screw) H3 Pitch width

Claims (1)

[Scope of utility model registration request] 1. A plurality of printed boards (1) arranged in parallel.
In the steady rest structure, the mounting holes (4, 16) formed at the common positions of the respective printed boards and the mounting holes are inserted into the mounting holes and are partially locked to the edges (3a, 16a) of the mounting holes. The steady rest (1) having grooves (12, 18) formed according to the arrangement pitch width (H3) of the printed board.
0, 17) and screws (13, 15) for fixing the steady rest to the base (5).